/*
 * Copyright 2013-2019 Xia Jun(3979434@qq.com).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 ***************************************************************************************
 *                                                                                     *
 *                        Website : http://www.farsunset.com                           *
 *                                                                                     *
 ***************************************************************************************
 */
package com.farsunset.cim.sdk.server.slc.coder;

import com.farsunset.cim.sdk.server.slc.constant.SlcCIMConstant;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToMessageEncoder;

import java.nio.charset.Charset;
import java.util.List;

/**
 * 发送消息前编码
 */
@ChannelHandler.Sharable
public class AppTextMessageEncoder extends MessageToMessageEncoder<String> {
    private final Charset charset;

    public AppTextMessageEncoder() {
        this(SlcCIMConstant.DEF_CHARSET);
    }

    public AppTextMessageEncoder(Charset charset) {
        this.charset = charset;
    }

    @Override
    protected void encode(ChannelHandlerContext ctx, String data, List<Object> out) {
        ByteBufAllocator allocator = ctx.channel().config().getAllocator();
        ByteBuf buffer = allocator.buffer(data.length());
        buffer.writeBytes(data.getBytes(charset));
        out.add(buffer);
    }

}
